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MILTON E. SMITH AND MAURICE F.

PATENT OFFICE.

GEER, OF ROCHESTER, NEW YORK,

ASSIGNORS OF ONE-THIRD TO PAUL O. BREWER, OFSAME PLACE.

ELECTRIC BATTERY.

SPECIFICATION forming part of Letters Patent No. 527,298, dated October 9, 1894.

Application filed March 29, 1894. Serial No. 605,618. (No model.)

To all whom it may concern.-

Be it known that we, MILTON E. SMITH and MAURICE F. GEER, both of Rochester, in the county of Monroe and State of New York, have invented a new and Improved Electric Battery, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved electric battery, which is simple and durable in construction, very effective in operation, and arranged in such a manner that the electro-motive force of the battery is greatly increased and the connecting wires are not liable to become accidentally detached from the electrodes.

The invention consists of certain parts and details, and combinations of the same, as will be hereinafter described and then pointed out in the claim.

Reference is to be had to the accompanying drawing, forming a part of this specification, in which the figure is a sectional side elevation of the improvement.

The improved battery is provided with the usual jar A, in which is set a porous cup B, containing the positive electrode 0, made preferably of zinc, having four wings or plates all cast in one piece, the said cup B being filled with an exciting fluid formed of chromic acid and sulphate of zinc in contact with the surface of the positive electrode 0. In the jar A is also held the negative or carbon electrode E, extending into a solution of sulphuric acid and water or, other suitable fluid F, held in the jar A and surrounding the porous cup B.

Each of the electrodes 0 and E is provided on its upper end with a threaded binding post G or G, respectively, both alike in construction and each formed with a body G having an aperture G for the reception of the conducting wire. A slot G formed in the body Gr leads to the said aperture G and on the threaded body screws a nut G adapted to be locked in place by the spread members of the body formed by the slot G By reference to the drawing, it will be seen that after the wire is inserted in the aperture (l of the respective post, and the nut G is screwed down on the post to engage the said wire, then the two members of the post formed by the slot G spread above the top of the nut, so as to prevent accidental unscrewing of the nut and consequently preventing loose contact of the conducting wire with the respective post and electrode. The binding post G for the negative electrode E is preferably supported in a copper plate H attached to the upper end of the carbon E.

The exciting medium D of the character described, may be used in liquid or in solid form, it being understood that the proportions of the chromic acid and sulphate of zinc vary according to the use for which the battery is designed. However, for general work, we prefer nine parts of chromic acid to one part of sulphate of zinc. In any event, the amount of acid used is in excess of the quantity of sulphate of zinc.

By the arrangement above described ahigh electro-motive force with relatively moderate action upon the elements is obtained, and the cost of the battery is greatly reduced owing to the comparatively moderate destructive action on the elements by the exciting medium, as above described. It will further be seen that as the destructive action on the elements is greatly reduced, the life of the battery is greatly increased and amalgamation or other protection of the zinc is completely avoided. By one charge of the mixture for forming the exciting fluid the life of the battery is greatly increased, and the expense and difficulty of renewing of the exciting fluid and the elements contained in the battery, is greatly diminished. No unpleasantordaugerousfumes are produced in the battery from the mixture of the chromic acid and sulphate of zinc above referred to. By the especial construction of the binding posts, a positiveand reliable contact of the conducting wires is insured at all times.

It will be obvious that the arrangement of Having thus fully described our invention,

we claim as new and desire to secure by Let porous eup, said fluid containing chromic acid, ters Patenti V a substantially as shown and described. Aneleetric battery, comprising a jar, a

negative electrode extending into a suitable MILTON E. SMITH. 5 fluid contained in the said jar, a porous cup MAURICE F. GEER.

held in the said jar and extending into the Witnesses: said fluid, a positive electrode held in the said RoBT. W. CLARK, porous cup, and an exciting fluid in the said A. L. CLARK. 

